Electrical accumulator



July 29, 1941. T. E ToRKELsoN ELECTRICAL ACCUMULATOR 1958 2 Sheets--Sheell l Filed May 14 FIG. 3.

c/ lNVE'fyR ATTORNEY July 29, 1941 T. E. ToRKELsoN 2,250,847

f ELECTRICAL AccUMULAToa Filed May 14, 193s 2 sneets-shet 2 Flag.

ATTO R N EY A Patented July 29, 1941 UNITED sTATEs PATENT oFFlcE 2,250,847 ELECTRICAL AccUMULA'roa Torkel E. Torkelson, Baldwin, N. Y., assigner to International Business Machines Corporation, New York, N. Y., a corporation of New York Application May 14, 193s, serial No. 207,977

(c1. zas-61.6)

9 Claims.

'Ihis invention relates to record controlled accounting machines and, more particularly, to electrical accumulators employed in such machines.

'I'he principal object of the present invention resides in the provision of a novel accumulator of the strictly electrical type and means to apply the same to a record controlled accounting machine. f f

Other objects of the invention include the provision of means to energize successively a series of relays by multiple impulses representing a value entered in said series; the provision of means by which each relay, upon being energized` prepares the next relay in the series for energization and concurrently renders the previous re-v lay in said series ineffective; the provision of means to maintain the last energized relay of the series in an operated condition; and the provision of an entry control means, independent of the duration of the impulses, to limit the sequential advance of the relay series to one relay for each impulse.

According to the invention, a record controlled accounting machine is provided with a record sensing means to detect value designations on a recordand to control thereby an impulse initiating circuit so as to impress a number of impulses corresponding to each sensed value on an entry circuit to a series of relays, thus causing said relays to be successively energized, the last relay energized in each series representing the value entered therein. Holding circuits are provided to maintain the last-energized rel'ay in each series in its operated condition until a subsequent sensing cycle causes the energization4 of the next higher relay in the series. Each relay of the series, upon being operated, conditions the next higher relay in the series for operation upon entry of the next impulse vand concurrently breaks the holding circuit to the previous relay. Consequently one and only one relay 11T-each series is maintained energized at a time.

Each series of relays becomes a denominational yorder of the accumulator and it is obvious that any convenient number of series may be utilized according to the requirements oi the accounting wok to be done. Transfer means is then provided to take care of the overow from lower orders into next higher orders when said :l

lower orders pass from 9to 0. Since only one of the relays of each orders remains energized at a time, a simple read-out means is provided including extra contacts associated with yeach of the accumulator relays which, when operated, condition circuits for total printing the amounts standing in the accumulator. Resetting of the accumulator`is accomplished electrically by a simple means whereby the holding circuits to all relays are broken, thus wiping out instantaneously the amounts previously standing in the accumulator. After the resetting operation, the ilrst relay in each denominational order of the accumulator becomes automatically energized and serves to represent a zero reading in that order. r

, Further objects of the instant invention reside in any novel'feature of construction or operation or novel combination of parts present in the embodiment of the invention described and shown in the accompanying drawings whether within or without the scope of the appended claims and irrespective of other specic statements as to the scope of the invention contained herein.

In the drawings: Fig. 1 is a sectional view of an accounting Imachine showing the location of the various in Fig. 1 will now be set forth, it beingunder` stood that thedelectrical accumulator forming the subject matter of the invention is not limited inits application to the machine disclosed but may be applied as well to other types of accounting machines.

Card feeding and sensing mechanism ."gear 20 is a clutch driving element I9 which is consequently in constant motion. Lying in the plane'oi' clutch element I9 is a springy-pressed dog I8 which is carried by and pivoted to 'a cam 22. An armature latch I1 normally holds the pawl I8 out of engagement with the driving element I9. Upon energization of magnet Il, latch I1 isrocked counterclockwiae to release pawl Il whereupon a spring moves it into `engagement with the driving element I! to cause rotation of cam 22.

The cam 22 is secured to shaft F so that the shaft rotates in unison with the driving element I9. Cam 22, as it rotates, rocks a bell crank follower lever 23 and, through a link 24, oscillates arms 25 which have pin and slot` 'connections with a card picker 2B which is suitably mounted for vertical reciprocation. The downward move-` ment of picker 26 advances a card C fromthe feed magazine 21 to the uppermost pair of feed rollers 28 which continue the downward movement of the card to further pairs of feed rollers 28. The several pairs of feed rollers are interconnected by gears generally designated 29 and are driven by a suitable gear secured to the shaft F so that the rollers 28 are in motion during the rotation of shaft F. n

The record cards C are placed in the magazine 21 so that the index point positions of the cards pass the sensing station which comprises individual sensing brushes 30 and common contact ((9,1) 181,1 ((7) its!!! 115,1) (141,! 3, 2, 1, and (Fig. 5). For each revolution of shaft F, a record card isadvanced from the hopper to a position shown in Fig. 1 in which brushes 30 are about to sense vthe 9 positions of the card. n

As the cards advance toward the sensing position, they engage and rock a pivoted card lever 32 which causes the closure of card lever contacts designated CLC. The function of the card lever contacts in causing the cards to continuously feed is fundamental in the art and is readily seen from the machine circuit diagram which will be presently described. 'I'he cards on leaving the sensing station are carried by additional feed rollers 28 to receptacle 33.

General machine circuits The motor M is connected across the line so as to be continuously running. When start key ST is depressed, a card feed cycle is initiated because of the energization of the card -feed clutch malt` net I6 by a simple circuit.from positive line l2, feed clutch magnet .IIL start relay R2I coil, contacts of start key ST now closed, normally closed contacts of stop key SP, to negative line In order to cause the cards to continuously feed after the start key is released, card lever contacts CLC are closed by the card as it passes down to the sensing station as previously described, and card lever relay R2! is thereby ener- 1 acuden Accumulating mechanism' The accumulator comprises a series of ten relays one for each digit in an order and electrical circuits connected thereto such as disclosed in the circuit diagram (Fig. 2). In this diagram, an accumulator having three columns or orders is shown as representative, it being understood that more orders may be provided as the case necessitates to accommodate numbers having higher denominational orders. The three orders shown are thel units, tens and hundreds orders respectively and will be referred to as such in thev specific description of the accumulator which follows.

First considering the accumulator before any values have been entered therein, the zero relays R0 of each order are maintained energized to indicate a zero reading of the accumulator. The circuit to maintain relay R0 in the units order, which is similar to that for relay Rin each of the other orders is as follows: positive line 62, reset contacts 6I, conductor 64, contacts R91: to RIb in their normal positions, R0 coil, con- `ductor 65, to negative line 63. 'I'hus the RII coil is held energized and consequently contacts R00 are closed to prepare for the energization of the RI relay on the first impulse entered into each denominational order,

For purposes of explanation, assume that the ilrst record card to reach the sensing station has value designations representing an amount of 678 to be entered into the accumulator (Fig. 5).

Taking first the units order, as the record card is fed down so that the 8 designation passes under a brush 30 at the sensing'station, a circuit is completed to condition the units order of the accumulator for entry. of a value of 8. therein. This preparatory circuit is as follows: positive line 02, card lever relay contacts R2Iib now closed, circuit breaker contacts 1I, common contact roll SI, 8 designation on the record card, brush SII, jack Il, plug wire to jack 86, relay coil RI I, conductor $1, cam contacts 69 to negative line Il. Relay coil RI I becomes energized closing its RI Ia contacts which then provide a holding circuit to gized closing contacts R2IIa. A holding circuit is thereby established for the feed clutch magnet II as long as cards are feeding which may be traced f from positive line 82, feed clutch magnet Il, start relay R2I coil, contacts R2Ia and contacta R2la both now closed, normally closed contacts of the stopI key SP, to negative line This circuit may be broken at any time by the depression of the stop key and thus cause the card feed mechanism to be halted for the purpose of placing additional cards in the hopper or for taking totals from the accurnulators.v Obviously, the circuit will be automatically broken when the cards run. out or fail to feed, since contacts CLC willopen causing relay R20 to become deenergized.

maintain coil RII energized. Contacts RI Ib are also closed at the same time'which, in the case of an 8 designation on the record card, is at "8in the card feed cycle, The closing of contacts RI Ib conditions the entry circuit to the units order so as to permit circuit breaker contacts 12` to impress eight consecutive impulses upon it, this being the number of impulses emitted by contacts 12 in the remaining portion of the cycle in which the entry circuit was conditioned. It

' will be noted that circuit breaker contacts 12 are adapted to emit 9 impulses per cycle, representing nine digit value increments each having a unit value, but the number oi impulses actually impressed on an entry circuit depends upon the' differential time in the cycle at which said entry circuit became conditioned,`which in turn is dependent upon the position ofthe sensed value designation on the record card. In orderto provide some time for the conditioning of the entry circuit as explained above, the timing of circuit breaker contacts- 12 has been delayed slightly from the actual index point positions of the card feed cycle as may be seen inthe timing chart (Fig. 3).

To continue with the example, upon the rst of eight impulses to be sent to the units order,

relay RI is energized by a circuit from positive line 62, circuit breaker contacts 12, contacts RI Ib now closed, contacts Ri2b, relay coil RI3, contacts Rl 3b, contacts Rllc now closed, relay coil RI, to negative line 63. AUpon the energization of relay RI, the previously'described holding circuit for relay R is broken by the opening of contacts Rib. However, contacts Rib are paired up with contacts Rla so as to become make before breakV contacts, that is, contacts Rla make before contacts Rib break thereby concurrently providing a maintaining circuit for relay RI subject to be broken by the next im` pulse entered. This circuit is similar to that for the R0 coil and may be traced from positive line 62, key contactsv 6i, conductor 64, contacts RSb to R212, contacts Ria, relay coil Ri, conductor 65 to negative line 63.

It might be well to mention at this point that relay RIB, which was energized by the first impulse impressed on the entry circuit, is of such construction that its time of operation is slightly longer than that for any of the relays R0 to R9. The purpose of this relay is to prevent a faulty condition which might arise if, for example, the

card feeding mechanism was slowed up considerably thereby increasing the duration of the 'impulses sent to the accumulator to the point where of the "make before breaktype,already described and therefore when this relay'is energized a brief holding circuit is established through its contacts as follows: positive line 62, circuit breaker y contacts 12, contacts RII'b, relay coil RIS, contacts RiBa, to negative line 63. This circuit will be broken as soon as circuit breaker contacts 12.

open, causing coil RI3 to become deenergized once again so that the entry circuit will be es-V tablished through-RIM) for the next impulse sent from the circuit breaker contacts 12.

The circuit for the second impulse will then be from positive line 62, breaker contacts 12, contacts RI Ib, contacts RI 2b, relay coil RI3, contacts Rl3b now back in their normal position,

l contacts Rfid, contacts Ric, relay coil R2, conductor 65 to negative line 63. A holding circuit for relay R2 is provided similar to that alread described for RI) and RI.

Like circuits are established and broken by the impulses which follow. After 8 successive im-v the fact that the pairs of contacts with common center straps associated with relays of the accumulator are of the make before break type, a maintaining circuit is provided for each relay a result of which the former relay becomes deenergized. That is, upon energization of relay R3, for example, relay R2 becomes deenergized and relay R3 is maintained energized until relay R4 is energized, etc. After the eighth impulse, relay R8 will be maintained energized until the next sensing cycle and thus signifies an entry of 8 678 is standing in the accumulator as denoted by an energized relay in the hundreds, tens, and

units orders. l

Now assume that the next 'record card has an amount of to be read from it and that it is desired that this amount be added to the 678 already standing in the accumulator. In the units order the ve impulses following the sensing of a 5 designation on the record card will energize R9, RII, RI, R2, and R3 relays in a manner already described. It will be noted that a pair of contacts Rliarare provided-in series with the R9 coil so that-upon energization voi relayy R0,

contacts Rdgwill open and break the'holding cir- The impulse following the energization of relay R 9 in the units order will cause carry relay Ri to be energized as follows: positive line 62, circuit breaker contacts 12, contacts RI Ib, contacts RI 2b, relay coil RIB, contacts Rl3b through contacts Rfid to R811, contacts R9c now closed, contacts Rlllb, carry relay coil RII), conductor,

7 cam contacts 69, to negative line 63. Thus, carry relay RIII is energized and operates its contacts Rina which are designed to close before its other contacts RIOb open so as to provide a holding circuit for this relay. In the tens order, R9 being the last relay energized, a contact RSf is closed which permits the carry impulse to add one in all orders standing at 9 immediately to the left of the order in which the carry impulse was initiated. In the particular example lselected, after the adding portion of the cycle the amountrepresented by the accumulator vwould be 693 as a partial sum of 678 and 25. Then during the carry portion of the cycle, an electrical carry impulse is initiated in the units order because, while adding, this order passed through 9. and 0. This carry impulse is directed to add one in the tens order and by means of contact R9! this same impulse will cause one to be added to the hundreds order to give the correct total o! 103.

In order that the above carry entries can be made into the tens and hundreds orders, the carry pulses, relay 8 becomes energized. Because of energized, and, upon energization of the next" higher relay'in the series, this circuit is, in effect,

shifted to maintain the latter relay energized, as

entry circuit to these columns must be conditioned by the energization of relay coil RI2 through cam contacts 68 which make just after Ri2f open and thus provide a cut-olli to prevent l any further impulses from circuit breaker conpositive line 62, carry cam contacts 10, carry relay contacts Rlc now closed, via conductor to contacts Rl2c also closed, relay coil RI4, contacts Rl4b, contacts Rd to R8d and R9d in the tens order, via conductor 16 to coil R0 in the tens order, conductor 11, to negative line 63. At the same time, since the R9 rela`y of the tens order was left energized at the end of the adding portion of the cycle, a carry entry circuit is also completed to the hundreds order as follows: same as for the tens order to conductor 15, then through contacts R9! in the tens order, conductor 18, contacts Rl2e now closed, relay coil R15, contacts Rl5b, contacts Rlid to R5d, contacts RGc now closed, relay coil R1, conductors 19 and 11 to negative line 63.

As a result of the above circuit operations,the true total of 703 is accumulated for the entries of 6'78 and 25 from successive cards passing the sensing station. Obviously, any amounts may be arranged to be accumulated by providing a sumcient number of denominational orders in the accumulator, the amounts chosen for the specific example being sufilcient to bring out the principles of operation of the strictly electrical accumulator disclosed.

Printing mechanism The printing mechanism is operated from 'a shaft designated P upon which is freely mounted a gear 20a to which is secured clitchdriving element 88. Cooperating with element V`r 38 is a spring-pressed pawl 81 which is carried by a cam 39 secured to shaft P. Supported by and pivoted to the cam 89 is an armature latch 86 which normally holds the pawl 31 out of engagement with driving element 88. Energization of clutch magnet 35 causes the latch 38 to release pawl 31 for engagement with driving element 38 whereupon shaft P is caused to rotate. y

Cam 89 cooperates with a follower lever 4l attached to shaft 4I. Arms 42 are also securedto shaft 4| and have a bar 48 extending between their extremities. ment of the type carriers 44 which carry type elements 45 past the printing position opposite platen 45. 4As the type carriers 44 move upwardly, notches 41 pass the nose of stopping pawl 48 in succession. During such movement, energization of print selecting magnet 48 attracts its armature 48a to trip pawl 48 into engagement with` one of the notches 41, the notch selected depending upon the time of energization. of magnet 49. Where a type bar 44 is not positioned for printing a digit, the lowermost type element will advance beyond the printing position.

For each type carrier there is provided a pivoted hammer 52 normally latched in the position shown by latch 52a.- Extending across the latches is a bail 5I pivoted at 8Ia and having arm and link connection 58 to the arm 42 at a point on the arm' between shaft 4I and rod 43. The proportion of parts is such that as arm 42 moves clockwise, bail 8l will move in the same direction and near the extremity of the movement of arm 42, the bail will rock latches 52a clockwise to release the hammers 52.

Total taking from the accumulators is accom-:

Bar 48 controls the move-l plished by means of a total print emitter and total print contactsl associated with the accumulator relays to allow circuits to be established between the total print emitter and the print magnets. T'he emitter, designated as 8U in Fig. 2, is secured to the print shaft P and consequently remains stationary except during a. total taking cycle.

In order to initiate a total cycle, total key T is depressed and causes print clutch magnet 85 to become energized by means of a simple circuit from positive line 82, print clutch magnet 35, contacts operated' by total key T now closed, to negative line 63. The energization of clutch magnet 35 causes shaft P to turn in a manner already described. The print emitter 80 therefore also turns and sends out timed impulses over the various established total print circuits from the accumulators.

rlhe total pri t circuit from an accumulator is as follows: negative line 6.3,.emitter 80, contacts e of the energized relay (any one from Rlie to R89) of a given accumulator column, jack 8|, jack 82, print magnet 49, common conductor 83 to positive line 62. g Assume that the accumulator column has a 3 standing in it, then, on total taking, a circuit would be completed at a predetermined time in the cycle from the 3 segment of the emitter through the R3e contacts to a print magnet 48.

After the total has been printed, the accumulator may be reset to zero by depressing reset key to open key contacts 8|. Immediately upon the opening of these contacts the holding circuits to alll accumulator relays are broken; and upon the release of the reset key', contacts 6I close once more to establish holding circuits to all R0 relays of the accumulator, thereby indicating zero amounts standing therein'. These holding circuits have been previously described in detail in A connection with the explanation of the accumulator circuits. It will be noted that no mechanical drive is necessary, that the resetting action is instantaneous, and that the energization of the relays R8 is automatic upon release of the reset key.

Summary of operation It has now been shown how, upon the sensing of differential valuedesignations on a record, a plurality of impulses corresponding to each of the sensed values are entered into the various orders of the accumulator to energize successively a series of relays in each of said orders, the number of relays energized in an order corresponding to the number of impulses entered into that order. Each relayin a series, upon being energized, prepares the next higher relay for energization and concurrently breaks the holding circuit for the f' previous relay in the series. Means is provided to maintain the last-operated relay in each series energized until the next higher relay in the series becomes energized. Contacts associated with the relays condition circuits for total printing amounts standing in the accumulator as represented by the last relay energized in each denominational orders. A simple electrical resetting means is provided to clear amounts instanianeously from 'the accumulator at any desired While there has been shown and described and pointed out the fundamentalnovel features of the invention as .applied to a single modification it will be understood that various omissions and substitutions and changes in the form, and details manifesting or accumulating means comprising a series of relays and variable entry circuit means therefor, means controlled by the sensing means at a dierential time in accordance with the sensed value for closing the switch to render the circuit interrupter eiective'to cause a predetermined number of the initiated impulses representative of the sensed value to be impressed on the variable entry circuit means so as to energize the relays in sequence according to the number of impulses `so impressed, variable -holding circuit means for holding the lastenergized relay in its operated condition and being arranged to energize and hold the rstdelay of the series energized should no other relay'in the series be energized and each relay,` upon being energized, controlling the variable entry circuit means to condition the next relay in the series for energization and concurrently rendering the holding circuit means for the previous relay ineffective.

2. In an accounting machine controlled by a record, means to analyze said record for valueV representations, a control circuit including repeatedly operating contact means for initiating a plurality of differentially timed periodic impulses during a predetermined time interval, value manifesting or accumulating means comprising series of relays and variable entry circuit means therefor, means controlled by the analyzing means upon analysis of a value representation for conditioning the control circuit at a differential time to render the contact means effective to cause a predetermined number of the initiated impulses during said time interval to be impressed on the variable entry circuit means to energizethe relays in sequence according to the number of impulses so impressed, variable holding circuit means for holding the last energized relay in its operated condition and arranged to energize and hold the initial-relay of the series energized in the event that no other relay is energized, and each relay, upon being energized, controlling the variable entry circuit,

means so as to condition the next relay in the series for energization and concurrently controlling the variable holding circuit means so as to render the previous relay ineffective.

3. In an accounting machine controlled by a record, means to analyze said record for value designations thereon, circuit means including a cyclically operating circuit controller for setting up a plurality of diierentially timed periodic impulses during a. cycle, value manifesting or ac*- cumulating means comprising a series of relays and shiftable entry circuit means therefor, means controlled by the analyzing means upon analysis of a value designation for rendering said circuit means operative at a differential time to impart a predetermined number of the impulses to the shiftable circuit entry means in succession during the cycle to energize said relays according to the number of impulses so imparted, shiftablev holding circuit means for maintaining the last cn- 75 ergi'zed relay in its operated condition and arranged to energize and holdthe initial relay in the series should no other relay in said series be energized, and each relay, upon being enerl gized, shifts the entry circuit mans'so asjto condition the next relay in the series for energization and concurrently shifts the holding circuit means so as to render the previous relay ineffective.

4. In an accounting machine controlled by a record, means to sense a digit value designation on said record, an impulse circuit including means to initiate dilerentially timed periodic impulses, accumulating means comprising a series of electromagnets one for each digit value, variable entry circuit means for said series of magnets,

means under control of the sensing means for coupling said entry circuit means with said impulse circuit at a diiierential timein accordance with thesensed yalue so as to render the impulse initiating means eiective to impress asuccession ofA impulses of a xed number representing the digit value on the entry circuit; means to energize said magnets in accordance with the number of impulses so impressed, contacts controlled by each of said magnets upon becoming energized by one of said impulses for 'varying said entry circuit means to 'condition the next magnet' in the series for operation upon occurrence ofthe next impulse, and other contacts alsolunder control of each of the magnets upon becoming energized for maintaining one and only one .magnetA of the series energized at a time, the`last mentioned contacts automatically providing for energization of the initial magnet of the series should noy other magnet be energized.

5. In an accounting machine controlled by a record, means to sen-se a digit value designation on said record, an impulse circuit including a circuit interrupter for initiating differentially .timed periodic impulses, accumulating means comprising a series of electromagnets oneV for.

each digit value, shiftable entry circuit means for impulses for shifting the entry circuit means 'so as to energize the next magnet in the vseries upon occurrence of the next impulse, and `other contacts also under control of each of thevrelays upon becoming energized for maintaining one and only one magnet of the series energized at a time, the last mentioned contacts being arranged automaticaily to energize the initial magnet of saidA series should no other magnet be energized.

6. In an accounting machinev controlled by 8 record, means to analyze said record for digit value designations thereon, an impulse circuit including a circuit interrupter for eilecting a succession of periodic impulses during a predetermined time interval, accumulating means comprising a series of fast energizing electromagnets one for each digit value, changeable entry circuit means including `a relatively slow-to-energize magnet and normally closed contacts for controlling entry into said series of magnets adapted to be operatively connected to one o! said magnets at a. time, means under control o! the analyzing means for coupling the entry circuit means with the impulse circuit upon analysis of a value designation so as to render the circuit interrupter effective at a diflerential time to impress a predetermined ilxed number of impulses on theentry circuit means in acordance with the analyzed value to energize the magnets of said series in accordance with the number of impulses so impressed, the magnet ci the entry circuit means being energized'upon/each impulse to bring about the opening of the normally closed contacts to limit the duration ci said impulse so as to prevent morc than one relay of the series from being energized for each impulse, contact switches controlled by each of the magnets of the series as each-becomes energized by one of said impulses for changing the connection of the entry circuit means to the next magnet of the series and other contact switches also under control oi' each of the relays as each becomes energized for maintaining one and only one relay oi.' the series energizedat a time.

7. In an accounting machine controlled by a record, means to analyze said record for digit value designations thereon, an impulse circuit including cyclically-operating contact means for eilectin'g a succession of periodic impulses dLuing a cycle, accumulating means comprising a series of fast energizing .electromagnets onefor each digit value, switchable entry circuit means for said series of magnets adapted normally to have operative connection with one of said magnets at a time and including a relatively slow-to-energize magnet and normally closed contacts, means under control oi' the analyzing means for coupling the entry circuit means with the impulse circuit upon analysis of a value designation so as to render the contact means effective at a dinerential time to impress a predetermined fixed number oi' impulses on the entry circuit means during said cycle in accordance with the analyzed value to energize said series magnets in accordance with the number pi' impulses so impressed, the magnet or the entry circuit means being energized upon each impulse to bring about 'the opening of the normally closed contacts to limitl the duration of said impulse so as to prevent more than one relay of the series from being energized for each impulse, switch means actuated by each of said series magnets as each becomes energized by one of said impulses for switching said entry circuit means so as to condition the next magnet in the series for operation upon occurrence oi' the next impulse, and other switch means also under control of each o! the magnets of the series operated concurrently with the first mentioned switch means for' maintaining one and only one magnet of the series energized at a time, the last mentioned switching means being arranged automatically to energize the initial magnet of the series in the v event that no other magnet of vsaid series lsrecord, means to analyze said record for digit value designations thereonl an impulse circuit including a circuit controller for setting up a constant number of dierentially timed periodic im- `pulses during a predetermined time interval, ac-

cumulating meanswomprising a series of tast operating electromagnets one for each digit value, switchable entry circuit means for said series of magnets adapted to be operatively connected to one of said magnets at a time and including therein a control magnet and a pair of normally closed contacts, means under control of the analyzing means upon analysis of a value designa-v tion for coupling the entry circuit means with the impulse circuit at a diierential time dependent upon the magnitude of the digit value so as to cause impulses set up by the circuit controller thereafter until the end of the predetermined time interval to be impressed on the entry circuit means to energize said series magnets in accordance with the number of impulses so impressed, the control magnet of the entry circuit means becoming energized upon each impulse to break the electrical coupling between the entry means and the impulse circuit so as to definitely limit the duration of an impulse to prevent more than one relay being energized for each impulse, switch means actuated by each of said series magnets as each becomes energized by one of said impulses for switching said entry circuit means so as to condition the next vrelay in the series for operation upon occurrence of the next impulse, and other switch means also under control of each of the series magnets 4operated concurrently with the first mentioned switching means for maintaining one and only one relay of the series energized at a time, the last mentioned switch means being arranged automatically to effect energization oi the initial magnet of the series in the event that no other of the circuit magnets is energized.

9. In an accounting machine of the character described, means including a circuit interrupter for transmitting impulses representing like increments of digit values, accumulating means comprlsing a series of relays, one for each digit value, shiftable entry circuit means for said series of relays, means to couple the entry circuit means with the circuit interrupter to impress on said entry circuit means a iixed number of the emitted impulses corresponding to a digit to be entered into the accumulating means so as to successively energize a corresponding number of relays therein, and means controlled by each of said relays as each becomes energized for shifting the entry circuit means to condition the next higher relay in the series for energization, and further Vmeans controlled by each of said relays to concurrently render the previous relay in said series ineective comprising a shiftable holding circuit for maintaining the last energized relay in its operated condition, said circuit also being ettective to energize and hold the nrst relay oi the series should no other relay be energized. 

